If you are new to MM and LibHistoire this is not for you. These would only be useful if you wanted to import old data prior to 06/01/2021, from old backup files you have saved.
These are Importers for Master Merchant 3.0 to allow users to import old MM data or old Shopping List data. Although I do feel that the Shopping List data could be obsolete at this point and would be removed if the time stamp has expired.
However, for Master Merchant if you are a hard core data collector and you have data from 2015 in some backup files then importing your old Master Merchant data would still be useful.